About 3D Convert

A small hub of free tools that convert 3D files in your browser.

There are two tools so far: a mesh converter that moves a model between OBJ, STL, PLY, OFF and glTF/GLB, and an E57 to PLY converter for laser-scan point clouds. CAD interchange is planned.

How it is built

Both tools stream. A file is read through a sliding window and written out as it is decoded, so peak memory follows the batch size rather than the file size, and a model larger than your free memory still converts. Where a conversion genuinely needs random access to every vertex — turning an indexed mesh into STL, which has no index — the vertices are staged on disk through the browser's own private storage rather than held in RAM.

How it is checked

Every conversion in the test corpus is compared against independent readers — trimesh, meshio, the ASTM reference implementation for E57, and the Khronos glTF validator for GLB output. Agreement is judged on the triangles themselves, so a difference in vertex ordering or indexing does not hide a difference in shape.

Privacy by design

Conversion runs entirely on your computer. The site does not receive your meshes, scans, or any other project file. There is no upload API for them.

Who it is for

Surveyors, reality-capture teams, BIM/VDC staff, and anyone who needs a quick format change without installing desktop software or sending data to a third-party cloud.

Ads

The site may show Google AdSense ads to keep the tools free. Ads are separate from file conversion. See the privacy policy for cookie and ad details.